Politicians are crooks.
Writers and philosophers are pseudo intellectual, philandering snobs.
Unions are beep
Such is life.
Also,I read this analysis, and now the movie makes much more sense to me. Julio and Tenoch end up being driven apart by the very classicism they were oblivious too during the movie.
http://the-artifice.com/y-tu-mama-tambien-political-perspective/
Limit of the Willing Suspension of Disbelief: directly proportional to its awesomeness.